Current front and rear brakes are coming to the end of life and want some bigger brakes to look nicer behind the wheels.

Was thinking either 335i or M3 brakes? i know the 335i are an easy swap on the front its the rears that im having issues with. would i need the complete set up ie caliper, carrier, discs, pads and handbrake shoes?

can you fit either of those set-ups under a 17" wheel as my winter are 17" summers are 18"